Need Help on Adwords Vouchers

I have never used Adwords and don't know how to use it. Yesterday, i did a service for someone and in return i was given Adwords voucher.

I don't know how to use it so i have a few questions:

1. How to check if the voucher works or not. (Expiry date as told to me is October 2009)
2. If i want to use the vouchers for PPC, do i still need a credit card or i can just create an account with adwords and using the voucher start my campaign.

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